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Helms

From Diablo Wiki

The head is one of the most vulnerable and important parts of the body, so protective headgear of all sorts have long been a staple of a decent suit of armour. The simplest designs consist chiefly of a tight-fitting leather or metal cap, securely fastened to remain atop one's head. More advanced designs include faceted sides to deflect and absorb attacks, noseguards and gorgets to protect the nose and neck, and even visors that close over the face. A sturdy helm may be one of the best investments an adventurer can make.

The Circlet and Coronet are types of headgear found only in the Expansion. Their stats are listed on the main headgear pages, but click to the Circlets page for more info about them.

Sockets: As of v1.09 in D2X you can find helms with 3 sockets only on Hell. Up to 2 sockets can be found in Normal and Nightmare.

Item Level: Is used in many in-game calculations, including which monsters can drop an item, what Clvl you need to be to have that item offered to gamble on it, and more. Full list of Mlvls found on Darkness.

Circlets are a type of headgear, but have many differences. Full details Circlets here.

Diadem

50-60 Defense 20 Durability Str Req: None Item Level: 85 Clvl Req: 64

Magic Level: 18 ** Max Sockets:* Norm: 1 NM: 2 Hell: 3

Notes: * Helms found on Normal and Nightmare can have at most two sockets. Some helms can have up to three but only when found on Hell. This refers to grey, socketed helms, not blue magical ones, Artisan's can add 3 sockets to a helm on any difficulty level.
** Magic Level is a property found only on the four types of Circlets. You add this number to your Clvl when determining possible modifiers, thus enabling you to potentially get higher level modifiers on a Circlet than your character could on any other item in the game. See the Circlets page for more details.